Too Much To Handle

Maybe I'm just a pervert, but when I meet someone new my mind runs on sex at some point. Even when I'm not sexually attracted to them, I'll wonder what their sex life is like or how they even manage to have sex. The former and latter refers to fat people. I'm talking waddling-not-walking fat and things-getting-lost-on-your-body fat. Do they have sex? With that extra weight, what are the mechanics like? I couldn't be with a person where we have to lift parts of their body out of the way (an episode of Inside Brookhaven Obesity Clinic had a shower scene that amazed me). Even someone who isn't morbidly obese, are their sexual positions limited? How easy is it for them to masturbate?